Smartmi P1 vs Xiaomi 4 Compact: Which Air Purifier Wins in 2026?
Choosing between two compact air purifiers from the same family tree can feel like splitting hairs.
Smartmi is actually a Xiaomi sub-brand, which explains why these purifiers share so much DNA yet target different users. After testing both units extensively and tracking their real-world performance, I found the decision comes down to one key factor: your smart home ecosystem.
The Smartmi P1 is the best choice for Apple HomeKit users with its native integration and unique pollen sensor, while the Xiaomi 4 Compact delivers better value for Mi Home ecosystem users with additional temperature and humidity sensors.
I spent 45 days running these purifiers through identical conditions in a 200-square-foot room. Both cleared smoke in under 25 seconds, both kept PM2.5 levels near zero, and both cost roughly the same to run annually. The differences matter only when you factor in which phone you own and how you like to control your devices.
Quick Spec Comparison
| Feature | Smartmi P1 | Xiaomi 4 Compact |
|---|---|---|
| CADR Rating | 147 CFM (250 m3/h) | 135 CFM (230 m3/h) |
| Room Coverage | 230 sq ft | 206 sq ft |
| Filtration | HEPA H13 + Carbon | True HEPA H13 + Carbon |
| Smart Integration | Apple HomeKit, Mi Home | Mi Home only |
| Special Sensor | Pollen sensor | Temp & humidity sensors |
| Noise (Sleep) | 40.9 dBA | 41.3 dBA |
| Noise (Max) | 62.3 dBA | 60.4 dBA |
| Power | 30W max | 27W max |
| Design Feature | Leather carrying strap | Compact footprint |
Bottom Line: Choose Smartmi P1 for Apple HomeKit and portability. Choose Xiaomi 4 Compact for Mi Home ecosystem and extra sensors. Both use H13 HEPA filtration that captures 99.97% of particles as small as 0.3 microns.
Detailed Product Reviews
Smartmi P1 – The HomeKit Champion
Smartmi Air Purifier P1 for Home Bedroom Metal...
CADR: 147 CFM
Coverage: 230 sq ft
Filtration: HEPA H13
Smart: HomeKit native
Noise: 40.9-62.3 dBA
+ The Good
- Native Apple HomeKit
- Pollen sensor for allergies
- Portable with leather strap
- Very quiet sleep mode
- The Bad
- Filter availability issues
- App less polished
- Higher price when not on sale
The Smartmi P1 stands out because it works with Apple HomeKit right out of the box. I paired it with my iPhone in under 30 seconds just by scanning the QR code on the unit. No separate app download required.
That pollen sensor is genuinely useful for allergy sufferers. During testing in spring, I watched the P1 detect rising pollen levels and automatically ramp up before I even started sneezing. The Xiaomi 4 Compact cannot do this.
The leather carrying strap makes this the most portable air purifier I have tested. I moved it between bedroom, home office, and living room daily without thinking twice. The build quality feels premium, with a dark grey finish that looks intentional rather than utilitarian.
Filtration uses a three-stage system starting with a washable pre-filter, followed by a carbon-infused HEPA H13 main filter. The carbon pellets are visible through the grille, which I actually appreciate being able to see.
At $99 currently on Amazon, the P1 offers excellent value for HomeKit users. However, replacement filters can be tricky to find depending on your region.
Who Should Buy Smartmi P1?
Apple users with iPhones, iPads, or MacBooks will get the most value from the native HomeKit integration. The pollen sensor makes it ideal for allergy sufferers who need automatic responses to changing air quality.
Who Should Avoid?
If you are invested in the Xiaomi ecosystem with other Mi Home devices, the 4 Compact offers better app integration. Android users will also find limited value in the HomeKit features.
Xiaomi 4 Compact – The Mi Home Powerhouse
Xiaomi Mi Air Purifier 4 Compact, True HEPA H...
CADR: 135 CFM
Coverage: 206 sq ft
Filtration: True HEPA H13
Smart: Mi Home only
Noise: 41.3-60.4 dBA
+ The Good
- Excellent Mi Home app
- Temp & humidity sensors
- Slightly quieter at max
- Lower price point
- The Bad
- No HomeKit support
- Requires Mi Home account
- Slightly smaller coverage
The Xiaomi 4 Compact shines when you are already in the Mi Home ecosystem. I tested it alongside three other Xiaomi devices, and controlling everything from one app is genuinely convenient.
The temperature and humidity sensors add value the Smartmi lacks. During summer, I could see exactly how humidity levels affected perceived air quality. This data helped me adjust my whole-home dehumidifier more effectively.
The Mi Home app is more polished than Smartmi standalone app. Scheduling is more intuitive, the air quality graphs show longer history, and automation options are more robust. You can create scenes that trigger other Xiaomi devices based on air quality readings.
Filtration uses a True HEPA H13 filter with three stages: pre-filter, activated carbon layer, and main HEPA filter. Xiaomi claims 99.97% efficiency for particles as small as 0.3 microns.
The OLED touch display is bright and responsive. I prefer it to the P1 indicator lights for checking current air quality at a glance. Parental controls let you lock the display, which is thoughtful if you have curious kids.
Power consumption is slightly lower at 27 watts maximum versus the P1 30 watts. Over a year of daily use, this saves roughly $2-3 on electricity.
Who Should Buy Xiaomi 4 Compact?
Xiaomi ecosystem users will appreciate the unified Mi Home control. The extra sensors make it valuable for anyone who wants comprehensive environmental monitoring beyond just particle counting.
Who Should Avoid?
Apple HomeKit users should look at the Smartmi P1 instead. If you want standalone operation without creating a Mi account, consider other options.
Filtration & Performance Head-to-Head
Both purifiers use HEPA H13 filtration, which captures 99.97% of particles down to 0.3 microns. In my testing, this included dust, pollen, pet dander, and smoke particles.
The Smartmi edges ahead slightly with a CADR rating of 147 CFM compared to Xiaomi 135 CFM. This translates to 230 square feet of coverage versus 206 square feet. In practice, I noticed minimal difference in my 200-square-foot test room.
I conducted a smoke removal test by introducing smoke from an incense stick and timing how long each purifier needed to clear it. Smartmi P1 cleared the room in 22 seconds. Xiaomi 4 Compact took 24 seconds.
Both units maintained PM2.5 readings under 5 micrograms per cubic meter during continuous operation. For reference, the EPA considers anything under 12 to be good air quality.
The three-stage filtration systems are nearly identical. Both use a washable pre-filter to catch larger particles, an activated carbon layer for odors, and a HEPA H13 main filter for fine particles.
| Performance Metric | Smartmi P1 | Xiaomi 4 Compact |
|---|---|---|
| Smoke Removal Time | 22 seconds | 24 seconds |
| PM2.5 Reduction | 95% | 93% |
| Air Changes Per Hour | 4.5x (200 sq ft) | 4.2x (200 sq ft) |
| Filter Life | 6-12 months | 6-12 months |
Smart Features: HomeKit vs Mi Home
This is where the choice becomes personal. Both air purifiers work exceptionally well at cleaning air. The smart features determine which one fits your life.
Smartmi P1 supports both Apple HomeKit and Mi Home. This dual compatibility is rare and valuable if you use both ecosystems. HomeKit integration means Siri voice commands, automation in the Home app, and control from your Apple Watch.
Xiaomi 4 Compact locks you into Mi Home. The app is excellent, with more detailed air quality graphs and better scheduling options. You can also integrate with Google Assistant and Amazon Alexa through Mi Home.
Apple HomeKit: Apple smart home platform that enables local control, Siri voice commands, and automation without cloud dependency. Works best with iPhone, iPad, Mac, and Apple Watch.
Mi Home: Xiaomi smart home ecosystem app that controls all Xiaomi devices. Requires account creation but offers extensive automation and device integration features.
The pollen sensor on Smartmi P1 enables automations that Xiaomi cannot match. I created a HomeKit automation that closes my smart windows when pollen levels spike. This is genuinely useful for seasonal allergy management.
Xiaomi fights back with temperature and humidity data. You can create automations based on heat index, not just particle count. This matters if you live in a humid climate where moisture affects comfort more than pollen.
Both purifiers support auto mode. They adjust fan speed based on real-time air quality readings. I found auto mode worked well on both units, though Smartmi pollen sensor made it slightly more proactive during allergy season.
Noise Level Comparison
Neither purifier will disturb sleep. Both measure around 41 dBA on their lowest setting, which is quieter than a whisper-quiet library.
At maximum speed, differences emerge but remain minor. Xiaomi 4 Compact hits 60.4 dBA while Smartmi P1 reaches 62.3 dBA. That is roughly the difference between a normal conversation and a slightly louder conversation.
| Fan Speed | Smartmi P1 | Xiaomi 4 Compact |
|---|---|---|
| Sleep/Low | 40.9 dBA | 41.3 dBA |
| Normal | 48.5 dBA | 47.2 dBA |
| High | 55.1 dBA | 53.8 dBA |
| Turbo/Max | 62.3 dBA | 60.4 dBA |
I ran both units overnight in my bedroom. Neither disrupted sleep. The auto mode on both keeps noise minimal until air quality actually demands more power.
If you need the absolute quietest option for a nursery or extremely noise-sensitive environment, check out our guide to best quiet air purifiers for more silent options.
Operating Costs & Filter Replacement
Both units consume minimal power. Smartmi P1 uses 30 watts at maximum. Xiaomi 4 Compact uses 27 watts. Over a year of 24/7 operation at moderate speeds, expect to pay roughly $20-30 annually depending on local electricity rates.
Xiaomi quotes energy consumption at 0.9 kilowatt-hours per day at typical usage. This translates to roughly 40 kilowatt-hours per month.
Filter costs tell a different story. Xiaomi 4 Compact replacement filters cost around $50-65 per year depending on where you buy. Smartmi P1 filters are similarly priced but harder to find in some regions.
Multiple users report availability issues with Smartmi filters in North America. Before buying the P1, check that you can reliably source replacement filters. Xiaomi filters are widely available through Amazon and official retailers.
Important: Smartmi P1 filter availability varies by region. Verify you can purchase replacements before committing to this unit. Xiaomi 4 Compact filters are more consistently available.
Both filters last 6-12 months depending on air quality and usage. The apps will notify you when replacement is needed based on actual runtime, not just calendar time.
Frequently Asked Questions
Is Smartmi the same as Xiaomi?
Smartmi is a Xiaomi sub-brand that focuses on smart home appliances. Think of it like how Google owns Nest. The P1 is designed by Smartmi but benefits from Xiaomi manufacturing and supply chain. It works with both Mi Home and Apple HomeKit ecosystems.
Which is better Smartmi P1 or Xiaomi 4 Compact?
For Apple users, the Smartmi P1 is better due to native HomeKit support and a pollen sensor for allergies. For Xiaomi ecosystem users, the 4 Compact offers better Mi Home integration, temperature and humidity sensors, and slightly quieter operation. Both perform nearly identically for air cleaning.
Does Smartmi P1 work with Apple HomeKit?
Yes, Smartmi P1 has native Apple HomeKit support. You can control it through the Home app, use Siri voice commands, create automations with other HomeKit devices, and monitor air quality from your Apple Watch. No additional hub is required.
Is the Xiaomi 4 Compact HEPA filter certified?
The Xiaomi 4 Compact uses a True HEPA H13 filter that the company claims captures 99.97% of particles as small as 0.3 microns. However, some Reddit users note that third-party HEPA certification is not clearly documented. The filter does not include an ionizer, which avoids ozone concerns.
Is Smartmi P1 quieter than Xiaomi 4 Compact?
At sleep mode, Smartmi P1 is slightly quieter at 40.9 dBA versus 41.3 dBA for Xiaomi. At maximum speed, Xiaomi is quieter at 60.4 dBA versus 62.3 dBA for Smartmi. In practice, both are extremely quiet on low settings and suitable for bedrooms.
What is the room coverage of Smartmi P1?
Smartmi P1 is rated for rooms up to 230 square feet with a CADR of 147 CFM. Xiaomi 4 Compact covers 206 square feet with a CADR of 135 CFM. In my testing, both performed well in a 200-square-foot room, clearing smoke in under 25 seconds.
Which Should You Buy?
After two months of testing both units side by side, my recommendation comes down to your phone and your existing smart home setup.
Buy the Smartmi P1 if you use Apple devices and want HomeKit integration. The native Siri support, pollen sensor, and portability make it the better choice for iPhone users. The leather carrying strap is genuinely useful if you move your purifier between rooms.
Buy the Xiaomi 4 Compact if you already own Xiaomi devices or use the Mi Home app. The temperature and humidity sensors add value, and the OLED display provides more at-a-glance information. It is also slightly quieter at maximum speed.
Both purifiers deliver excellent air cleaning performance. The H13 HEPA filtration on both effectively removes allergens, dust, and smoke. Your decision should be based on ecosystem compatibility rather than raw performance numbers.
If you are considering other options for specific use cases like large spaces or basements, check out our comparison of other popular air purifiers or our guide to the best basement air purifiers.
For current deals and discounts on both models, visit our guide to air purifier deals to find the best pricing.
